John Kelsey

is a writer and occasional woodworker in Connecticut.

When a torsion box shelf fails, it is most often because the screws that hold the ledger onto the wall have bent. To avoid this, it's best to use stout (V8-in.-dia. or !/2-in.-dia) lag screws and washers, and to make certain that at least two-thirds of the screw shank will be anchored in the wall framing. You can countcrbore the screws or cut pockets for them to get deeper purchase for the threads. (See left photo, above.)

If you anticipate removing a T-box shelf at some point, you can attach it to the ledger by driving screws through the top and bottom skins. But if you want maximum strength, you will have to glue the ledger into its pocket. Use long clamping cauls on the top and bottom edges of the ledger, as shown in the right photo, above.

A few layers of veneer under the center of each caul will help to apply clamping pressure there, as you tighten the clamps at each end. Clamp a temporary vertical strut to the front edge of your shelf, as shown in the above right photo, to keep the shelf level while the glue sets.

When the time comes to remove the clamps, there's a standard method for

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Wood Working for Amateur Craftsman

Wood Working for Amateur Craftsman

THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.

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